Act 3 Mission Gone - Bug?

In Act 3 I had the quest where i had to drain the waterways. However, before doing that I entered the Chimeral Wetlands and my mission is gone.

The only mission I have is "Travel to the Chimeral Wetlands". I could still speak to Alva at the waterway and seh told me to speak with Servi but I have no further instructions of what to do.... Anyone?

I think you need to find and beat the chimera.
Then you can access the area after beating it.